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Cris LaPierre

MathWorks

Last seen: 1 day ago |  Active since 2018

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Answered
TOOLBOX FOR ANATLYSIS OF FLEXURAL ISOSTASY
Here's where my googling led me: https://pubs.geoscienceworld.org/gsa/geosphere/article/13/5/1555/353716/Toolbox-for-Analysis-o...

8 hours ago | 0

Answered
Why I got an error in "plot(X1,sqrt(2*g*X1)*tanh(sqrt(2*g*X1)/(2*L)*t),'o')" in the following code??
There is no error in your code. Just a warning because you are plotting imaginary numbers.

10 hours ago | 0

Answered
I have a problem regarding an Index because it exceeds array bounds.
I suspect X is not the size you think it is. Since your error is saying that the max number of rows is 37, it appears that perha...

11 hours ago | 0

Answered
How to avoid horizontal shifts after applying GroupByColor on boxcharts?
Typically, groups of boxplots share the same x value (see here and here). So what is happening is MATLAB is making room for one ...

13 hours ago | 0

Answered
Error: Custom function fitting in MATLAB
data2fit2(:) and model_data(:) and weights4scaling do not all have the same size. A = rand(3) B = rand(2,1) % Your error A-B...

1 day ago | 0

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Answered
how can I process certien frames from a video?
How are you reading in your frames? Are you using VideoReader? I haven't tried it, but following the examples on the linked pa...

1 day ago | 0

Answered
Change UTC settings in Matlab Grader
If you are creating a MATLAB Grader course (i.e. hosted at grader.mathworks.com), you can set your timezone in the Edit Course s...

1 day ago | 0

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Answered
Seeking help to list all Yticks
You need to set yticks first, then assign a label for each tick. Something like this (updated code a little). data = readtabl...

2 days ago | 0

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Answered
How can I access a record of the Command Window using MATLAB Grader?
One workaround could be to write an assessment test that calls the functions using evalc. This captures the command window outpu...

2 days ago | 0

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Answered
Importing data from an Excel file with multiple tabs
Use the 'Sheet' name-value pair to indicate which sheet to read the data from. Documented here: https://www.mathworks.com/help/m...

5 days ago | 0

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Answered
Read data and transfer comma to dot with detectImportOptions
I would use readmatrix and specify the DecimalSeparator. d_lops = readmatrix('trial.txt','DecimalSeparator',',')

5 days ago | 0

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Answered
What is the meaning of x=x(:).'?
x=magic(5) x(:) x=x(:).'

5 days ago | 1

Answered
Plot 3d plot with different colors depending on the X and Y combination
See this page: https://www.mathworks.com/help/matlab/creating_plots/color-3-d-bars-by-height-1.html and this Answer: https://ww...

6 days ago | 0

Answered
MATLAB Onramp: Further practice section command window minimized
Will just add a comment that, in most course interactions, the command window is collapsed by design. This is because the intera...

6 days ago | 0

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Answered
I can't find system identification toolbox on apps even thought I have it installed, how can open it
You are installing a toolbox, with functions and apps that you can use in your code. It won't show up in the apps tab. However, ...

6 days ago | 0

Answered
Why am i getting error in wthresh? please help
I believe the issue is with your 2nd input. Valid inputs are 's' and 'h'. You are using 'soft'. y = linspace(-1,1,100); thr = ...

7 days ago | 0

Answered
Why is my code in Matlab Answers not colorful?
Not sure who you sent the email to, but please report this here: https://www.mathworks.com/support/contact_us.html

7 days ago | 1

Answered
Converting datenum to datetime when using writetable
You convert your datetimes to datenums, and then write those numbers to Excel, which is what you are seeing. Don't convert your...

7 days ago | 0

Answered
how to fix error message Invalid expression as When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.
You need to properly end the line that creates your legend. %this legend('x_1', 'x_2', 'x_3', ... (list all the state variable...

7 days ago | 0

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Answered
I am unable to find Signal Builder block in Simulink .
The Signal Builder block has been removed. For more information on why you should migrate your models, see Migrate from Signal B...

7 days ago | 0

Answered
Why will uifigure not create a window in r2023a?
For technical support, please contact support.

7 days ago | 0

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Answered
I am getting errors on my plot of live data collected from a rover.
You are trying to index to an element in your variable that does not exist. Position 1 is your rows index, The error message is...

7 days ago | 0

Answered
How to add a line on the surface plot at a specific x value?
Repeat the same process you did for making your surface, just adjust the x values to be your desired values. Note, I think you...

8 days ago | 0

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Answered
Converting table data to datetime
You need a date to make it a datetime (it will automatically use today if you don't supply one). Perhaps you want to use duratio...

8 days ago | 0

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I cannot use interp2 as MATLAB tells me my grid arrays do not have an NDGRID structure, but I am still able to do a surface plot with no errors.
EDIT: fixing variable assignment per @Jon's observations An ndgrid means your data is regularly sampled in space. If you look a...

8 days ago | 0

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Answered
Fitting equation to data
Use the 'Options' input to adjust the StepTolerance property. Create your input using optimoptions.

8 days ago | 0

Answered
how to create this type of plot having two signals on one axis?
Just use plot with hold on. It looks like your X values determine how they align. x1=1:5; y1 = 5:-1:1; x2=5:9; y2 = 1:5; ...

8 days ago | 0

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Answered
image to matrix but the matrix is to much coloumns and rows
The size of your matrix will match the resolution of your image. If you want less rows/columns, you will need to reduce the reso...

8 days ago | 0

Answered
Can't view my courses in My account.
You do not need a license to take an Onramp course - just a MathWorks account. Which one are you trying to launch? Try navigati...

8 days ago | 0

Answered
How do i generate the "furnace" in simscape or simulink?
It appears that image is taken from the House Heating System example. You can open this model by running the following command ...

8 days ago | 0

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